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is a significant concern for physicians. Central0 V3 t; t+ D# g5 _" k- O7 |+ n
precocious puberty (CPP), which is mediated1 m8 e0 ~ o" I
through the hypothalamic pituitary gonadal axis, has/ H: ?: K, R( Y3 I: H7 }) D
a higher incidence of organic central nervous system5 ?" ]8 s( l& B
lesions in boys.1,2 Virilization in boys, as manifested
0 D- j6 l, X$ i; d G1 n9 _by enlargement of the penis, development of pubic* q6 ]0 D: v! J* k
hair, and facial acne without enlargement of testi-+ J8 u5 E% r, e; _! Y2 j* K" J; W
cles, suggests peripheral or pseudopuberty.1-3 We F4 N" {& ^9 E9 m* z
report a 16-month-old boy who presented with the! V8 `) o9 B7 i! G; V
enlargement of the phallus and pubic hair develop-, k3 o' B) I% D+ g# \0 w. }
ment without testicular enlargement, which was due0 G3 E2 O7 G& F% s7 k1 h% O
to the unintentional exposure to androgen gel used by6 C5 ~+ H* M% P7 ]1 u
the father. The family initially concealed this infor-
. {5 ~7 Z3 _" q. T- O0 ]* |mation, resulting in an extensive work-up for this7 Z2 o- Y+ g& R7 P8 r& Z/ [7 J! O e6 \
child. Given the widespread and easy availability of
' v: n/ |- a p3 o1 N, k8 i( Mtestosterone gel and cream, we believe this is proba-, p7 a h! _1 W" f6 i/ n7 I0 b
bly more common than the rare case report in the! V- ]5 k8 \5 d5 u# ~& [# m1 G
literature.4
# o' s. u; N- R! F0 Y9 rPatient Report
6 A7 ?) @, `6 ~8 Q& k; UA 16-month-old white child was referred to the
6 B; } H' K) g( o" Xendocrine clinic by his pediatrician with the concern" S7 Y; r& `5 H% i& @' W1 W% ?) V
of early sexual development. His mother noticed
: ^6 u' U0 M, x; b6 k& M- Dlight colored pubic hair development when he was y% E+ }4 G5 D
From the 1Division of Pediatric Endocrinology, 2University of6 I6 C- u m* {% [$ s- u" Y$ K" V
South Alabama Medical Center, Mobile, Alabama." O: T& ]" v" e$ `8 E) ^$ ~& o. ~; e2 a
Address correspondence to: Samar K. Bhowmick, MD, FACE,- I( g% ?% i: \+ W: d v/ }2 T
Professor of Pediatrics, University of South Alabama, College of& M6 L2 F! ^" l5 M) _" d' y
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;7 i% s% q, O% G( L
e-mail: [email protected].
! E7 p( _7 q& J' X) Dabout 6 to 7 months old, which progressively became% \' L/ N* J6 }, Q) ~ s* \/ f
darker. She was also concerned about the enlarge-
2 S* \! s# l8 h, L8 X# y7 ament of his penis and frequent erections. The child
- {& h& p" e+ g0 d+ X6 m: `) cwas the product of a full-term normal delivery, with
- Q! S1 ^+ Y) e* J) Y5 ga birth weight of 7 lb 14 oz, and birth length of
$ ~# U9 o. P1 E. H& A( ^20 inches. He was breast-fed throughout the first year- Z x0 Z$ D8 z# R0 Z
of life and was still receiving breast milk along with5 Z5 g' ?! H3 \+ k6 Z
solid food. He had no hospitalizations or surgery,
: G! t Z) v. O& [- P, ~and his psychosocial and psychomotor development
% V% }$ w% @- X! Y$ _' V6 uwas age appropriate.9 s! E3 N$ X4 {" j
The family history was remarkable for the father,) ]$ ?5 D6 Q: N/ K
who was diagnosed with hypothyroidism at age 16,, c8 U7 [) O" x( m: a: Y: O9 [* z2 T/ H
which was treated with thyroxine. The father’s
7 N0 F! c) b4 }height was 6 feet, and he went through a somewhat
" I; U% R! j+ j: Cearly puberty and had stopped growing by age 14.# S* T0 T0 e7 K9 O2 ]/ }
The father denied taking any other medication. The
& N+ E8 f0 [, r+ g7 Bchild’s mother was in good health. Her menarche2 {1 T# f9 ]* L$ x/ Z: E( A
was at 11 years of age, and her height was at 5 feet
. z4 `. L+ X- A9 @+ p5 inches. There was no other family history of pre-! e: _, g2 N3 U+ r
cocious sexual development in the first-degree rela-: ~7 Q7 l+ p* ~4 B1 P7 T5 ^+ r+ _
tives. There were no siblings.
( i, C9 |4 O7 Q1 }, k {/ f P7 q* X8 RPhysical Examination+ r4 K, E4 A# `
The physical examination revealed a very active,
' h8 R; ?6 u3 c: u1 {8 g1 Fplayful, and healthy boy. The vital signs documented
; D& Q' d* c+ G6 Qa blood pressure of 85/50 mm Hg, his length was
* o6 l& ]+ B; I, j; }- B0 m90 cm (>97th percentile), and his weight was 14.4 kg J6 N: f9 K8 q/ Y. S, T
(also >97th percentile). The observed yearly growth
( k% F/ F& l4 Y" Y% ~velocity was 30 cm (12 inches). The examination of
( U' S7 E5 l- @7 J& y# _the neck revealed no thyroid enlargement.
% B1 P7 M( Y; g. V4 X0 @( ~The genitourinary examination was remarkable for
( z% ^6 N8 W+ o. _" \6 venlargement of the penis, with a stretched length of4 G6 ]1 r: x( C( b6 O7 i
8 cm and a width of 2 cm. The glans penis was very well, {5 @6 G3 C' k
developed. The pubic hair was Tanner II, mostly around; \0 W0 _3 x4 r/ V5 F! l7 [5 p
540
6 G! t+ M7 V, Y6 w, p4 fat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ V) r: v8 E& x, q1 _
the base of the phallus and was dark and curled. The: Z' f0 `( X5 ~* I( `
testicular volume was prepubertal at 2 mL each.( V+ ]" @3 O; u# u- g4 }% D
The skin was moist and smooth and somewhat2 d. i! e& v# }& T% T
oily. No axillary hair was noted. There were no
2 R4 S2 t* W3 A L4 \! ^abnormal skin pigmentations or café-au-lait spots.; U7 Y D: l; J4 w9 ? D
Neurologic evaluation showed deep tendon reflex 2+( O1 m2 [9 W+ q# s& A
bilateral and symmetrical. There was no suggestion6 M1 T9 b3 j$ n G" w- E4 s* ]
of papilledema.
0 H1 `' c4 t" G0 I E$ p, x+ C% {Laboratory Evaluation
- L! }* Y {8 |The bone age was consistent with 28 months by
y1 C8 ?8 e- l/ _using the standard of Greulich and Pyle at a chrono-! K5 j9 N* z; i" N: K
logic age of 16 months (advanced).5 Chromosomal! R: {8 J, P* T7 O) E1 ]7 `
karyotype was 46XY. The thyroid function test
( v5 o W! W% U; E) oshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
" e" M% Q! T' k- J% j) f0 Slating hormone level was 1.3 µIU/mL (both normal).5 @1 a$ g9 a2 A5 e7 l! {
The concentrations of serum electrolytes, blood" Q& o% `0 t& E a0 R
urea nitrogen, creatinine, and calcium all were
- t" D Q+ j( n3 {3 t" }9 Swithin normal range for his age. The concentration
; N* B1 {1 u G; n: u; @of serum 17-hydroxyprogesterone was 16 ng/dL4 J' L- O' u* `9 h( k! V8 L
(normal, 3 to 90 ng/dL), androstenedione was 20/ C, X: @* G L+ @4 @9 _0 U! `
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-1 a2 B( a/ M# n$ O
terone was 38 ng/dL (normal, 50 to 760 ng/dL),2 M# d# L2 H8 _- i
desoxycorticosterone was 4.3 ng/dL (normal, 7 to2 z6 i& E1 T% G/ }3 J# X8 u3 t
49ng/dL), 11-desoxycortisol (specific compound S)
9 O5 I3 ~2 b5 N# ?$ Twas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-/ M* N4 e: s+ j8 z
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total! p M, k7 D7 w; W! K
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
$ L1 q6 r! x* k: }: r: S) o9 fand β-human chorionic gonadotropin was less than
* J, T, u4 h4 \" C) y0 n, Q8 _5 mIU/mL (normal <5 mIU/mL). Serum follicular
) u( S! d$ X; b' W9 _! wstimulating hormone and leuteinizing hormone
# p& k6 R \7 J! i) @$ x" {; T7 R4 T F# ^concentrations were less than 0.05 mIU/mL
0 U! d: S5 Q& n/ K) O(prepubertal).& h: E5 |$ N5 o* X
The parents were notified about the laboratory- _8 k' [1 M$ a0 A) B" z5 `9 j
results and were informed that all of the tests were
4 M! c' T# |: h: M. Pnormal except the testosterone level was high. The
+ X# X7 A6 J0 i, G- dfollow-up visit was arranged within a few weeks to
" U6 W: A" w, q6 V, u F# P1 ~7 qobtain testicular and abdominal sonograms; how-
- P% Q( z) Q4 i3 N. `$ ~ever, the family did not return for 4 months.+ W7 b6 b6 p9 D: j# T
Physical examination at this time revealed that the! `. v4 g0 z2 T8 j* S( f+ B/ |
child had grown 2.5 cm in 4 months and had gained
! M$ V: N- I& b8 J. {% w2 kg of weight. Physical examination remained7 W5 h, I9 e O& L# d# i: O1 Z
unchanged. Surprisingly, the pubic hair almost com-
# H ?8 `" I9 @pletely disappeared except for a few vellous hairs at
5 z: q2 t( K* R( v" G! o1 N) Xthe base of the phallus. Testicular volume was still 2
7 B5 {2 |; _9 P& l* HmL, and the size of the penis remained unchanged.
0 T' `* H+ r$ R$ `% FThe mother also said that the boy was no longer hav-
# E8 Z8 ]2 Z# s( t0 t7 ping frequent erections.# ` }6 z% [/ g: I; ?
Both parents were again questioned about use of- I! X7 v" x i3 _/ V2 I4 s
any ointment/creams that they may have applied to# p) E7 r5 I" ^" H
the child’s skin. This time the father admitted the
, [# G6 h! z! e) p( bTopical Testosterone Exposure / Bhowmick et al 541
0 H: A9 Q2 j7 K( \9 X- r) Zuse of testosterone gel twice daily that he was apply-. o9 L5 I( S9 X4 F, C
ing over his own shoulders, chest, and back area for& y4 C& m: c2 c8 I% m8 ^& A0 O* i
a year. The father also revealed he was embarrassed' v0 O) `! Q: S6 e! s, i) D% c6 {
to disclose that he was using a testosterone gel pre-
4 b6 ]$ g: S, h1 Xscribed by his family physician for decreased libido3 s$ R ~. N/ u1 N- R" j
secondary to depression.- M9 @1 z$ U% g
The child slept in the same bed with parents.9 D' b$ o e% _! _% P
The father would hug the baby and hold him on his
/ K1 w& |# l- l" F0 achest for a considerable period of time, causing sig-
. M0 k! b# z' Z* V4 Dnificant bare skin contact between baby and father./ B: a: E: Z7 s( s% ^3 X
The father also admitted that after the phone call,. R8 ~9 O) ^7 M! u! V
when he learned the testosterone level in the baby, r$ l7 j! q, b, [1 A; p
was high, he then read the product information
' B: d( l9 Q. a0 Q; ~# X" kpacket and concluded that it was most likely the rea-/ I- K9 Q4 k* |8 Q j
son for the child’s virilization. At that time, they' B0 @9 _: H; W
decided to put the baby in a separate bed, and the
* O; y; b! J, r8 M! m; P3 ?father was not hugging him with bare skin and had
3 _' r- I) S5 `5 J. \. Jbeen using protective clothing. A repeat testosterone- x5 ]1 G1 c2 f) |3 n
test was ordered, but the family did not go to the
. p) |9 Z; G2 V }9 ^) E% d wlaboratory to obtain the test. g( x: G" a( H: J6 N8 w6 _& i: |
Discussion( a( J6 s. o5 I! e" g8 R. i) R
Precocious puberty in boys is defined as secondary
2 \# ]0 C$ j/ r4 i; U' usexual development before 9 years of age.1,4' @( X8 L8 F; D4 S: r/ }. A% H! m
Precocious puberty is termed as central (true) when! O0 a5 m5 B. r0 {6 B
it is caused by the premature activation of hypo-- E: Y+ M' H2 z& e* M$ }
thalamic pituitary gonadal axis. CPP is more com-9 K' n- @+ ^, G7 |9 K- r( ?3 M3 k
mon in girls than in boys.1,3 Most boys with CPP
. L# i( @$ P2 `* {0 zmay have a central nervous system lesion that is
0 Y( c8 Z* z2 Z$ z) n6 Jresponsible for the early activation of the hypothal-
/ [' b$ ~0 _! Y/ Mamic pituitary gonadal axis.1-3 Thus, greater empha-7 c8 g8 Z) j' G9 Y6 s
sis has been given to neuroradiologic imaging in
& N8 J3 P4 l0 D. p# l o8 P8 ]+ ~boys with precocious puberty. In addition to viril-' V5 y: g" q: ?% z
ization, the clinical hallmark of CPP is the symmet-; v w6 Z5 M4 c/ }& d1 F
rical testicular growth secondary to stimulation by
$ T3 w% o9 U/ I* |( v7 y3 o" U egonadotropins.1,37 k) C: _5 t# ?" M. J0 h8 o$ f$ v2 G
Gonadotropin-independent peripheral preco-
3 c' p4 {. ] Hcious puberty in boys also results from inappropriate# I5 _6 P/ n6 ~3 ?; L) Y' _
androgenic stimulation from either endogenous or7 k: r8 x* ]8 r4 Z+ H$ t
exogenous sources, nonpituitary gonadotropin stim-
8 c: d8 }$ e% c$ f5 Julation, and rare activating mutations.3 Virilizing
8 I6 a; x& H( K- jcongenital adrenal hyperplasia producing excessive& I5 {; r- \5 S* V( ~% G: }/ \9 n, @
adrenal androgens is a common cause of precocious
1 G1 C9 z L5 [: n. x @+ Vpuberty in boys.3,4
* f5 d: k! ~' y, g+ `) LThe most common form of congenital adrenal
4 b* @% W2 X4 p# p- shyperplasia is the 21-hydroxylase enzyme deficiency.7 S q" ]" ]/ L2 y
The 11-β hydroxylase deficiency may also result in
# g" g" D" X. T. z9 [excessive adrenal androgen production, and rarely,
7 v/ z/ m- ]" P8 L; Xan adrenal tumor may also cause adrenal androgen+ g( P- T9 d/ ]% q" m9 s
excess.1,3, A( P' [2 T" d# K3 |
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
1 b; a& Y2 z: E! _* c K542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
; D0 r3 ?* y* X) g1 B$ }A unique entity of male-limited gonadotropin-
6 n1 n* f2 ?+ U! m" j4 f+ h+ lindependent precocious puberty, which is also known, l) Q: P ?6 h ]
as testotoxicosis, may cause precocious puberty at a
# n) z( O6 m+ V8 pvery young age. The physical findings in these boys
( ~2 \# q: B- V' jwith this disorder are full pubertal development,
7 l$ N: Y) ~1 [. m! zincluding bilateral testicular growth, similar to boys9 f2 n$ ^2 s C, V
with CPP. The gonadotropin levels in this disorder) x& Y* Z, ?8 v1 |9 g7 X
are suppressed to prepubertal levels and do not show
" |! A2 U2 P4 W; V- [. N+ ~pubertal response of gonadotropin after gonadotropin-0 L! @) k( Y# ]
releasing hormone stimulation. This is a sex-linked
4 ~5 f* |7 ~4 D& F' Y& T5 Gautosomal dominant disorder that affects only, X4 z4 H0 |# t% W- n. h1 R) p
males; therefore, other male members of the family
( k- R' j7 k& S: d8 O# }may have similar precocious puberty.3* a6 f- P( M1 j: y: l- ]
In our patient, physical examination was incon-
& `' A& k" O# d9 [sistent with true precocious puberty since his testi-
1 V, Z! z- b. p* q& e" W c; f# Lcles were prepubertal in size. However, testotoxicosis
3 z/ V W$ ^5 ~was in the differential diagnosis because his father& Y& q3 o. y( O3 ^
started puberty somewhat early, and occasionally,& h9 Z8 y$ R. D) x
testicular enlargement is not that evident in the
) \+ }7 j, x1 J w, [" g4 P7 `beginning of this process.1 In the absence of a neg-
9 u$ v' Z3 g1 a% B# Z2 I6 S4 Kative initial history of androgen exposure, our! @7 q- n/ ^: W6 y% n m, k
biggest concern was virilizing adrenal hyperplasia,
$ W( T' g: F0 c: ?6 X3 teither 21-hydroxylase deficiency or 11-β hydroxylase5 `8 V# J; g( W |
deficiency. Those diagnoses were excluded by find-
" ~" Q( F. y- ^1 F* ping the normal level of adrenal steroids.
3 r u, Z2 ^% b* rThe diagnosis of exogenous androgens was strongly
' [4 c: U$ `. l: csuspected in a follow-up visit after 4 months because, p; F" ~( g8 I0 X" i4 ]- M
the physical examination revealed the complete disap-
+ I9 a# I# t% V* v) Fpearance of pubic hair, normal growth velocity, and: W u3 s9 i1 T) S5 k& A
decreased erections. The father admitted using a testos-) ^8 ], [: }7 f2 r
terone gel, which he concealed at first visit. He was8 k5 P1 f7 m- Q% g0 S7 j9 J
using it rather frequently, twice a day. The Physicians’
& w" T' z/ ^, J8 UDesk Reference, or package insert of this product, gel or" w; U5 A+ a6 a* s7 Z" r# Q- a
cream, cautions about dermal testosterone transfer to3 ]0 d5 a: A* u2 a! }
unprotected females through direct skin exposure.+ G8 Q5 m4 K6 X$ s
Serum testosterone level was found to be 2 times the
! n* a/ E) R; mbaseline value in those females who were exposed to h( g" c( ^' f/ D+ ^ e
even 15 minutes of direct skin contact with their male2 R) _$ Z4 P4 a+ F! V- d
partners.6 However, when a shirt covered the applica-
) u2 _1 U" w; h6 F* Ftion site, this testosterone transfer was prevented.
; q5 }5 }* H: N3 f% b$ sOur patient’s testosterone level was 60 ng/mL,
; a J4 t# e6 m1 X( vwhich was clearly high. Some studies suggest that
. f/ W/ l& ?$ Q3 ^3 |3 P& Bdermal conversion of testosterone to dihydrotestos-/ F, m0 i u* {0 ?/ j. k! o/ N$ C( `
terone, which is a more potent metabolite, is more R' v8 q. e( n- ~
active in young children exposed to testosterone
, q* Z1 c0 s; J" aexogenously7; however, we did not measure a dihy-
' C( ~' Q: b* M- |7 \drotestosterone level in our patient. In addition to
- |! h, O- c+ ?# _6 r& ivirilization, exposure to exogenous testosterone in
2 y- \1 ]5 t) P4 }children results in an increase in growth velocity and
0 n. e# j+ \+ ?' n1 H6 Hadvanced bone age, as seen in our patient.2 B# y+ v" w1 {' k t
The long-term effect of androgen exposure during
( R: }9 _2 |3 y/ oearly childhood on pubertal development and final7 N5 n# H1 L: r* W' X5 ?8 B
adult height are not fully known and always remain
; m* G% Q' n1 s8 p2 P, e6 ya concern. Children treated with short-term testos-7 J& L$ f- ~# h% T: c
terone injection or topical androgen may exhibit some
: Z5 J4 x1 H1 q2 a) @" [$ k. o- cacceleration of the skeletal maturation; however, after
3 i R# S/ |. i D- `cessation of treatment, the rate of bone maturation
- ^& u$ k% W$ ]+ n9 ~decelerates and gradually returns to normal.8,9* E* ~& {+ N1 F& [/ q7 Q i! m
There are conflicting reports and controversy! ]$ l+ Z5 C+ J7 q1 [; m
over the effect of early androgen exposure on adult" K' Z$ L6 ~: t! i7 ~7 U
penile length.10,11 Some reports suggest subnormal
5 \4 x2 u" T; v* L8 w9 t' Badult penile length, apparently because of downreg-0 u- `' Q6 F' n1 c
ulation of androgen receptor number.10,12 However,( L$ l3 C0 M/ C) M- q5 H
Sutherland et al13 did not find a correlation between6 b) Y9 c" Y8 N
childhood testosterone exposure and reduced adult
+ h0 m4 a% e8 p" A/ F6 wpenile length in clinical studies.
" I2 |: V+ F9 |$ F. J6 K7 FNonetheless, we do not believe our patient is
" u8 D( u, e" L# ]* `going to experience any of the untoward effects from
& s. D2 n( ^% C1 ntestosterone exposure as mentioned earlier because8 E/ c1 u3 h3 ]! C
the exposure was not for a prolonged period of time.2 M6 x9 D/ i+ \4 L9 B, Z- ~
Although the bone age was advanced at the time of5 u9 S% B* J6 q; Z; F
diagnosis, the child had a normal growth velocity at( I* f# B, J8 D. R* d: _# F
the follow-up visit. It is hoped that his final adult' V9 H2 D* n% W6 C% s- ]9 f
height will not be affected.) {/ a' @2 y7 a: }) M. ~3 y
Although rarely reported, the widespread avail-
" Q4 U7 a1 z: b2 D2 {' _! jability of androgen products in our society may
' c# x! F& M: I, n6 ?3 x: C. L4 G* A0 `indeed cause more virilization in male or female" b1 P8 E8 U) _/ B/ j2 o0 S8 H
children than one would realize. Exposure to andro-
d4 w- T. l; Jgen products must be considered and specific ques-
* [6 J% ~# e$ T8 y( ntioning about the use of a testosterone product or+ n' ^' |' q4 R6 L
gel should be asked of the family members during
! T! O/ N2 H. ~the evaluation of any children who present with vir-
0 U2 K/ g* _ H) c1 o% d: ^ilization or peripheral precocious puberty. The diag-
6 R4 K" _. Q, J! v, _# D" Znosis can be established by just a few tests and by0 C+ `$ H5 n! i0 K/ F0 [
appropriate history. The inability to obtain such a1 }9 i9 I3 v! M
history, or failure to ask the specific questions, may# A& E9 ?0 d# ^. c3 d
result in extensive, unnecessary, and expensive- y& p, n$ j3 ~ |' S0 S/ V
investigation. The primary care physician should be
* z7 `8 |( `9 O X0 L# }1 T" s% D0 maware of this fact, because most of these children0 J& q( B+ N' I# L2 Q5 B$ H* O
may initially present in their practice. The Physicians’
1 @: ?& I- Z1 |2 _ [Desk Reference and package insert should also put a) B3 k# d0 u4 D6 d( x2 @( H( v; o
warning about the virilizing effect on a male or
6 @& v: P5 q% j/ Ifemale child who might come in contact with some-' T4 M+ {3 F( V q0 U/ X+ I, f4 c
one using any of these products.
# n/ j* f7 ~: T- B8 B6 N+ e9 eReferences
+ p$ n4 R Q3 d# B; q1. Styne DM. The testes: disorder of sexual differentiation3 K" ?1 `& v; _8 j9 _5 O0 q5 }. x
and puberty in the male. In: Sperling MA, ed. Pediatric
7 H8 r( Y6 w! h: r3 B1 Y5 [Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
! y5 K( R$ u# G2002: 565-628.* V2 j2 }! u, ^2 O4 U( r8 \
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
; i, F# w8 E5 qpuberty in children with tumours of the suprasellar pineal
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areas: organic central precocious puberty. Acta Paediatr.
# d7 m4 |2 n4 t& G2001;90:751-756.) ?; Z! K$ u. H7 H, U
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.$ ^$ x8 F' A, Q
Pediatric Endocrinology. 4th ed. New York, NY: Marcel5 a( |# G Y' W" P: ?8 d- G( q' |
Dekker Inc; 2003:211-238.
1 r$ G0 @* G* r1 g) U4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
3 e* w5 P( ]9 U) Z) Tdevelopment in a two-year-old boy induced by topical. S9 k, ], E/ ]" K: E& z( k' q
exposure to testosterone. Pediatrics. 1999;104:e23.
( \2 F, t" V6 ]2 J* E; D5. Greulich WW, Pyle SI, eds. Radiographic Atlas of! a' E. e: V! S' @9 R! g
Skeletal Development of the Hand and Wrist. 2nd ed.' f. N5 j& |; A$ m% I
Stanford, CA: Stanford University Press; 1959.. {- q( L3 G1 i+ H" z: @2 N
6. Physicians’ Desk Reference. Androgel 1% testosterone,
3 R7 ~) [5 a) bUnimed Pharmaceutical Inc. Montvale, NJ: Medical
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