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is a significant concern for physicians. Central6 q0 L( D k! J* d
precocious puberty (CPP), which is mediated2 b$ Z. R S2 x; ~9 F2 q8 b8 R6 S
through the hypothalamic pituitary gonadal axis, has0 L: c& E5 A, N( H
a higher incidence of organic central nervous system
) j& w$ S. Z; w4 Z* e7 ?lesions in boys.1,2 Virilization in boys, as manifested
9 A1 B! P/ Q0 V' t9 `by enlargement of the penis, development of pubic) H2 o0 m/ U+ g+ f, {' g
hair, and facial acne without enlargement of testi-; P& n, a. m. H
cles, suggests peripheral or pseudopuberty.1-3 We" N4 Q* T5 c9 ~5 c4 _, q- g7 V
report a 16-month-old boy who presented with the6 H+ f/ q% V0 J9 x
enlargement of the phallus and pubic hair develop-% a) _/ D: d q) U) ], p. e+ j
ment without testicular enlargement, which was due \* X+ l1 `. K8 e* `$ c
to the unintentional exposure to androgen gel used by
7 d3 I8 ]# W/ D0 {% N/ G W& Ethe father. The family initially concealed this infor-+ Z+ c4 J' \# s& [: k" V ?- E
mation, resulting in an extensive work-up for this, ~+ \8 p8 G$ D, h% T) X2 G
child. Given the widespread and easy availability of6 a% Z/ |& n T; Z0 s* w! f
testosterone gel and cream, we believe this is proba-* T% @# H' S& d! ~
bly more common than the rare case report in the
3 u# O$ i9 M& lliterature.4
) C1 z/ a F: l; r: @" x1 _* sPatient Report
2 X0 L9 I9 y3 Q' i: N1 BA 16-month-old white child was referred to the
' B7 r, t$ C# A9 F0 x0 Gendocrine clinic by his pediatrician with the concern
3 p8 _! @- S* I; nof early sexual development. His mother noticed: C% B# }0 H: i6 U9 G/ `8 N
light colored pubic hair development when he was
9 J5 x# y ]) l: p: ?. JFrom the 1Division of Pediatric Endocrinology, 2University of! R, Y" h, o: E8 v& s5 |0 |- V
South Alabama Medical Center, Mobile, Alabama., n9 q4 Z O7 t& Z7 K$ U( Z
Address correspondence to: Samar K. Bhowmick, MD, FACE,& {% K( Z& ~/ K# Y( @1 j6 H4 i
Professor of Pediatrics, University of South Alabama, College of
' t' ~7 }& I# uMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;, y& R( F& @& ^% _( Y" n, i& l
e-mail: [email protected].
1 c) R4 h2 a% \, Uabout 6 to 7 months old, which progressively became5 y7 |+ D# i, \- C9 {
darker. She was also concerned about the enlarge-, ^7 z# ?+ A# o; r( s! |/ i8 N
ment of his penis and frequent erections. The child
5 P/ }5 g; ]# \ J: Cwas the product of a full-term normal delivery, with! }# @: q# H: s9 f; x
a birth weight of 7 lb 14 oz, and birth length of9 y0 r) ^* D; C1 |
20 inches. He was breast-fed throughout the first year9 ^: q6 m$ t7 s0 G! V8 O7 _, H
of life and was still receiving breast milk along with% ^0 r. U4 J: q8 z4 }8 P* d, u
solid food. He had no hospitalizations or surgery,
! j- _8 C% c' xand his psychosocial and psychomotor development
2 ^ `4 i4 s6 n) \1 jwas age appropriate.
+ m, ?& F2 m; Y$ PThe family history was remarkable for the father,) E. j! c$ a# V& }4 \8 n% q
who was diagnosed with hypothyroidism at age 16,/ s+ Y6 y. I2 d7 H& [) j) } P5 a
which was treated with thyroxine. The father’s
: D% q9 T. U9 e+ D0 C% _ @; f3 ]height was 6 feet, and he went through a somewhat3 j' J2 F4 ~6 J9 l% z9 ]2 |
early puberty and had stopped growing by age 14.
1 [; ~- t0 Q* L: q$ NThe father denied taking any other medication. The8 ~; s* f3 h. k P Z2 X$ V: Q
child’s mother was in good health. Her menarche
$ T4 C5 j' z4 `was at 11 years of age, and her height was at 5 feet5 B3 z! H( V* P K% |/ ]
5 inches. There was no other family history of pre-
8 Q' ^) p7 k& H1 m* Dcocious sexual development in the first-degree rela-
9 x8 G8 }( [9 M% Z+ Gtives. There were no siblings.
, @$ A8 f; ^% b; IPhysical Examination
6 Q2 A5 a% Y% @7 uThe physical examination revealed a very active,$ E3 m: @# f8 `( e
playful, and healthy boy. The vital signs documented
- ]' ?+ B2 B+ F/ ua blood pressure of 85/50 mm Hg, his length was
% o0 c" q! t6 k8 F" _; U w" O90 cm (>97th percentile), and his weight was 14.4 kg
2 ?7 |7 f6 M3 ?(also >97th percentile). The observed yearly growth( }$ P0 Y- i0 W0 o
velocity was 30 cm (12 inches). The examination of
; t @" Y7 D% Z3 b3 `the neck revealed no thyroid enlargement.
6 h# b& }+ t- i4 \* H6 hThe genitourinary examination was remarkable for
( {. ^# ]$ Z% L9 A# o5 P4 I0 N2 Eenlargement of the penis, with a stretched length of |6 _7 i! L5 s) }$ }: s
8 cm and a width of 2 cm. The glans penis was very well
3 L/ n: q6 C1 V. W& f* J Qdeveloped. The pubic hair was Tanner II, mostly around
8 k# u% I1 k. s8 [0 g0 L) J( t* q5407 R W+ P) [% D6 ^: W
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the base of the phallus and was dark and curled. The
" k# v5 V5 l6 a a- `3 ]) T4 v# ktesticular volume was prepubertal at 2 mL each.. s% t6 P' g1 x9 G5 L* b$ Z4 Y. x
The skin was moist and smooth and somewhat
& k* i0 V1 v! Z' e) I4 O: `oily. No axillary hair was noted. There were no0 w& z" Z. x {. h l- m+ i
abnormal skin pigmentations or café-au-lait spots.+ X. H0 X! S0 O: ]
Neurologic evaluation showed deep tendon reflex 2+; c8 L" L/ I' _4 u9 H
bilateral and symmetrical. There was no suggestion, e0 k8 _ V: v
of papilledema.; E; }% q% ]5 ^$ k% P) m, E
Laboratory Evaluation& a+ X# p' c: g) }: Y# u8 ]
The bone age was consistent with 28 months by" U( L0 e( E0 b' e3 l2 A( s
using the standard of Greulich and Pyle at a chrono-
% l0 I/ ?7 @: a% }3 S/ L; q" Blogic age of 16 months (advanced).5 Chromosomal
( k: B6 u4 N8 n8 `karyotype was 46XY. The thyroid function test
6 m( E9 U. Q+ G* Rshowed a free T4 of 1.69 ng/dL, and thyroid stimu-, p2 {, ?. k; t! [
lating hormone level was 1.3 µIU/mL (both normal).
# m( D0 A( d( FThe concentrations of serum electrolytes, blood& }% W" G' [: x$ s- I) D
urea nitrogen, creatinine, and calcium all were" Z" k) Y5 X7 k% D( Z% U5 n8 y
within normal range for his age. The concentration
7 }; u1 t9 y1 F3 f- Bof serum 17-hydroxyprogesterone was 16 ng/dL
* }. n& j0 T$ }; j(normal, 3 to 90 ng/dL), androstenedione was 20
& ]& J6 |) L" U+ y4 c. V8 c, Ong/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
* A( G! f" T* m: B, h; cterone was 38 ng/dL (normal, 50 to 760 ng/dL),# @& c9 N2 k* \, y, G5 \. @/ B: j
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
( [8 f, q) z# ] j49ng/dL), 11-desoxycortisol (specific compound S)
4 a" n: U/ [8 p kwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
8 j- W6 h& a" w* I8 E& M" J- Etisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total4 X3 Y3 N+ d! f( `) ~! b
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
, V" x _ h+ v, F3 J& {3 Jand β-human chorionic gonadotropin was less than7 V6 _- r0 K" q
5 mIU/mL (normal <5 mIU/mL). Serum follicular( \& N" e8 B2 e& C
stimulating hormone and leuteinizing hormone D6 ]$ M! s% o9 J! P, g
concentrations were less than 0.05 mIU/mL) F$ o8 z/ b0 a. y" N. U1 v
(prepubertal).
: u; `3 ?# o+ ~( b9 XThe parents were notified about the laboratory. l1 l% b, s ]9 Z" o
results and were informed that all of the tests were
: C# U( C# v; o" Snormal except the testosterone level was high. The
}2 S" K- {1 D& t9 u- _% N3 a4 U) Vfollow-up visit was arranged within a few weeks to1 Y2 s7 B. Z7 j7 }
obtain testicular and abdominal sonograms; how-3 l% k1 Z4 W8 G+ J3 Z
ever, the family did not return for 4 months.
0 M* o+ j2 ~- D/ i5 s. [% vPhysical examination at this time revealed that the
! O) H& i3 P' K* q! b( K3 Qchild had grown 2.5 cm in 4 months and had gained
* ]+ T% S& T3 C5 D1 M2 kg of weight. Physical examination remained: T' \( C( q( }! ]2 h8 A3 P X% m
unchanged. Surprisingly, the pubic hair almost com-
) x! z. s9 E) c% ^: J4 v+ Apletely disappeared except for a few vellous hairs at
L' v: B6 i: @$ F& ]4 a1 N, Tthe base of the phallus. Testicular volume was still 2" G6 e- D* M: c2 P, ~
mL, and the size of the penis remained unchanged.
* A2 B# {$ N KThe mother also said that the boy was no longer hav-
, @( r5 k; ~5 \- k2 t# E& zing frequent erections.( k4 c( f6 Z9 J; {: U( i* q
Both parents were again questioned about use of
& p4 M* _# _+ }: ?5 t7 ~7 Aany ointment/creams that they may have applied to
K( s7 F) X) _8 a4 Kthe child’s skin. This time the father admitted the; [" s( _4 N/ i9 U
Topical Testosterone Exposure / Bhowmick et al 541
& C% j$ ]# l& l, a. u" `! Juse of testosterone gel twice daily that he was apply-; N2 Z: O& p- _1 j2 p9 S# a' r$ d
ing over his own shoulders, chest, and back area for+ m( x( W* ?1 y9 O k) c4 C
a year. The father also revealed he was embarrassed
- s& d( l @6 y9 G0 r9 z3 p& l6 uto disclose that he was using a testosterone gel pre-
/ G; k& q5 b+ e6 E4 k3 t3 Nscribed by his family physician for decreased libido2 @* E8 N" z+ N9 v. w8 \: L
secondary to depression.4 X- i6 I2 o' u8 p
The child slept in the same bed with parents.
9 B9 g! m6 e5 T, t; H% SThe father would hug the baby and hold him on his
& m; D5 r% y% e2 nchest for a considerable period of time, causing sig-2 t( ?& ^! M; M7 T. i K- L
nificant bare skin contact between baby and father.9 K* w& \6 r" ]1 e* v/ K6 ]( ^
The father also admitted that after the phone call,
+ @; E( N) b0 f+ L4 J ?4 S$ Hwhen he learned the testosterone level in the baby
8 _7 ~7 g# h4 G( l& P0 P+ uwas high, he then read the product information
! y m# r2 h6 }" _2 r3 o& l9 ~7 Wpacket and concluded that it was most likely the rea-
4 l# y7 X0 [( o3 vson for the child’s virilization. At that time, they8 S9 Q! d6 J! w/ m, Y# G- w
decided to put the baby in a separate bed, and the# q$ I; p5 D2 v2 {, |
father was not hugging him with bare skin and had9 x: Q/ U3 X3 w& o$ _* q; X
been using protective clothing. A repeat testosterone
5 N% o" k9 j9 V$ y0 B& C0 |test was ordered, but the family did not go to the! M# M4 b5 b" x" J y
laboratory to obtain the test.
% r. s7 B o! {1 I- ~+ R( [Discussion5 B; k4 N7 N4 q
Precocious puberty in boys is defined as secondary( \. { q( z2 e0 I+ m# {! a" H- o
sexual development before 9 years of age.1,4: k, S2 _% Z+ ^ t$ \* {
Precocious puberty is termed as central (true) when
( B* g; r$ z% n. D, T0 g2 j* pit is caused by the premature activation of hypo-+ k6 w) [+ }/ B5 V. r% N
thalamic pituitary gonadal axis. CPP is more com-0 e- b+ [: L; ~& C v! a
mon in girls than in boys.1,3 Most boys with CPP
! n3 a+ ]# v1 {/ K& N2 dmay have a central nervous system lesion that is! k# }% v/ d- D' V) L. S
responsible for the early activation of the hypothal-
5 o: F. s5 c0 Qamic pituitary gonadal axis.1-3 Thus, greater empha-: o$ y* A* i5 p; N( D( h5 {) X
sis has been given to neuroradiologic imaging in
0 Q, @& p! ^$ e% j. mboys with precocious puberty. In addition to viril-8 `, R3 s2 t* B2 ~7 K6 g
ization, the clinical hallmark of CPP is the symmet-
+ C% c4 d( @% k: `& Urical testicular growth secondary to stimulation by
" P1 C1 _- l9 R3 sgonadotropins.1,3
n3 x8 h1 b L7 H' c$ F0 _Gonadotropin-independent peripheral preco-) [) v$ }2 A! b- }1 T, K1 z
cious puberty in boys also results from inappropriate& G. Z* V& g) X( ?8 g% c- \) Z
androgenic stimulation from either endogenous or/ i1 e( F3 o" K9 |
exogenous sources, nonpituitary gonadotropin stim-- C! J' h \2 ?7 g* V2 @
ulation, and rare activating mutations.3 Virilizing
8 s7 Y" k. s$ z: B" rcongenital adrenal hyperplasia producing excessive! I5 {! [( _6 M) c- }
adrenal androgens is a common cause of precocious$ l, A! S+ \: P l; q2 K+ a
puberty in boys.3,4
: i- Z7 s8 t3 S6 \! gThe most common form of congenital adrenal
6 C7 i9 ~, ~4 z2 q& lhyperplasia is the 21-hydroxylase enzyme deficiency.
4 V6 {3 f& l V. qThe 11-β hydroxylase deficiency may also result in$ R+ _" X Z3 d
excessive adrenal androgen production, and rarely,% U! y% o3 V5 U! e; V2 m9 q8 Z
an adrenal tumor may also cause adrenal androgen
8 |0 B- |0 r1 u! p: ~) q, D2 z0 p8 |excess.1,39 L* h7 Y* Q+ E) |1 b" L; i
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from2 j( y7 y# U K0 i7 h7 |
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
0 h' ?6 @ F4 x7 L/ xA unique entity of male-limited gonadotropin-
/ h7 [7 s( R+ U' F. e. x; rindependent precocious puberty, which is also known! ^" E* G8 }- u# {; O
as testotoxicosis, may cause precocious puberty at a
+ C# r; d( E! [5 Q' \very young age. The physical findings in these boys
7 X5 |6 |9 B0 t$ e( v5 ~! @with this disorder are full pubertal development,2 j2 L# j+ C$ T, b1 v }4 o& k% k8 |- A
including bilateral testicular growth, similar to boys. h2 i6 t% v1 _. R) y7 u8 N
with CPP. The gonadotropin levels in this disorder
# M2 N3 m. s) h/ D& v m/ J* }are suppressed to prepubertal levels and do not show" L4 k& T. T$ n
pubertal response of gonadotropin after gonadotropin-
- T, |& z: g. C5 Oreleasing hormone stimulation. This is a sex-linked6 ?: {9 f# f9 x4 p+ E
autosomal dominant disorder that affects only( T" ~$ A8 c6 x" v$ ]
males; therefore, other male members of the family
( X6 P: a" a9 \. y7 ?# N3 Fmay have similar precocious puberty.3
: B8 f/ B/ E; `# |, z+ u8 q- ?' IIn our patient, physical examination was incon-" c& h; Z; J. G4 X7 B8 r
sistent with true precocious puberty since his testi-
. B9 J K; p: icles were prepubertal in size. However, testotoxicosis
$ y) e. }& Q1 I: d3 Zwas in the differential diagnosis because his father! Z/ d" _4 S) }3 Q
started puberty somewhat early, and occasionally,! g# p2 O) y) J6 r$ G) N
testicular enlargement is not that evident in the) R& k9 A" ~4 x1 t% g0 U, P
beginning of this process.1 In the absence of a neg- e! }' w: H5 H- a4 D
ative initial history of androgen exposure, our
; k, K" _4 Y- m; qbiggest concern was virilizing adrenal hyperplasia,( v, m6 E+ q! C
either 21-hydroxylase deficiency or 11-β hydroxylase
5 B& L6 Y' i8 c' P$ Cdeficiency. Those diagnoses were excluded by find-
; i, O1 Y: x( t4 v9 F. M& [, jing the normal level of adrenal steroids.
4 D9 F! W# U" G$ b9 eThe diagnosis of exogenous androgens was strongly% X& X7 |6 y* p% R& ]3 P8 {
suspected in a follow-up visit after 4 months because
* D3 \7 x& l* q) Nthe physical examination revealed the complete disap-
8 Q8 r/ g5 d/ r: hpearance of pubic hair, normal growth velocity, and' N" q a6 e3 x/ _8 j7 [3 ~/ U
decreased erections. The father admitted using a testos-: h+ {) t; x5 `& P9 _/ v
terone gel, which he concealed at first visit. He was
& _! J6 u2 P5 B# c0 husing it rather frequently, twice a day. The Physicians’0 \' d# N( N# Z& {1 M! o/ ^4 p
Desk Reference, or package insert of this product, gel or
' s( y6 X" |2 J9 s2 _! X2 ?$ icream, cautions about dermal testosterone transfer to" [. |6 c/ ^0 L, H
unprotected females through direct skin exposure.
- O8 F# P' |% J& {. ^Serum testosterone level was found to be 2 times the
% o8 |5 i/ ~. j3 j9 kbaseline value in those females who were exposed to2 q; | J4 [# w; e
even 15 minutes of direct skin contact with their male6 _! Y5 y" }" n7 U$ ^' P
partners.6 However, when a shirt covered the applica-: R/ M' D2 a/ h2 F
tion site, this testosterone transfer was prevented.
6 i/ b2 s( G5 L3 V' |- FOur patient’s testosterone level was 60 ng/mL,9 L# s9 o6 ]8 _; v) [) i9 v; a
which was clearly high. Some studies suggest that4 r, x1 X: _0 M1 k& a/ g* w J
dermal conversion of testosterone to dihydrotestos-
5 l3 }# H) J* H( a! O. _terone, which is a more potent metabolite, is more
1 |; q" }6 x* V$ R2 c6 L7 e' P1 _, ractive in young children exposed to testosterone% i$ u) K4 C5 {+ D
exogenously7; however, we did not measure a dihy-9 G# ]' ^ r3 S+ M& V k4 Y% [) |: j
drotestosterone level in our patient. In addition to' a$ j2 U* Y q ]
virilization, exposure to exogenous testosterone in
}) `4 K7 x& q: o$ p- S: J% Kchildren results in an increase in growth velocity and& g3 G- @1 q- H- [. x
advanced bone age, as seen in our patient.
8 m! g1 e- y( @- K; Z U: z" U+ PThe long-term effect of androgen exposure during
M5 g7 v6 _; f/ q; ~ Iearly childhood on pubertal development and final' R9 Y7 H# Y \& b( G9 q' T. ^
adult height are not fully known and always remain
' \7 V2 K+ V3 ]. `8 l' Da concern. Children treated with short-term testos-; N5 C/ v* S: N, I
terone injection or topical androgen may exhibit some
0 R* l" |: [: N/ M/ ]# \acceleration of the skeletal maturation; however, after3 [9 n- j; X/ W. r2 {
cessation of treatment, the rate of bone maturation% ^9 `0 T; f4 u- K$ U; j
decelerates and gradually returns to normal.8,9
" C& L, Q$ [- a+ n3 b) ]3 x1 i5 CThere are conflicting reports and controversy
9 I3 M) j, d9 {# f+ dover the effect of early androgen exposure on adult
; u8 C0 ?5 e8 i! c% S- H, v5 ]; gpenile length.10,11 Some reports suggest subnormal
* |, t+ E: R- G! H; W0 Dadult penile length, apparently because of downreg-
5 N+ B5 ~/ w7 [2 uulation of androgen receptor number.10,12 However,) r! D9 p! y$ H C) }( B' A; x
Sutherland et al13 did not find a correlation between- _+ h9 r- h5 H- O3 i
childhood testosterone exposure and reduced adult
3 n$ u7 ^+ m/ g% Z: upenile length in clinical studies.
! i: v9 Q# `& X& e/ b2 HNonetheless, we do not believe our patient is: I1 |9 ]) M% ~) O6 u ^% t$ Y' M
going to experience any of the untoward effects from
; }, O' Y3 q8 i5 ctestosterone exposure as mentioned earlier because" [3 v8 f% m$ S( }) D' P2 p. g
the exposure was not for a prolonged period of time.
4 \- T S! ?! i8 z6 LAlthough the bone age was advanced at the time of
2 D- h- p* y# y( k9 e8 d( C+ Idiagnosis, the child had a normal growth velocity at
- G8 p4 X, S) V; q7 i+ N' {the follow-up visit. It is hoped that his final adult
2 m) a8 v" g2 \# k& B, q1 gheight will not be affected.
$ c. d0 m& k7 N3 u, k4 wAlthough rarely reported, the widespread avail-( E) x1 Z9 w* X8 C3 N
ability of androgen products in our society may
4 [6 i& S4 H2 M& y/ g$ Eindeed cause more virilization in male or female; z9 M/ o4 q2 T. f3 ~
children than one would realize. Exposure to andro-: k4 }' R5 l+ c
gen products must be considered and specific ques-
9 v9 I9 L( g0 N8 ^' D( gtioning about the use of a testosterone product or! |- z1 k l6 P0 f5 A- R1 h
gel should be asked of the family members during
; G/ D: C- L# @% z; x athe evaluation of any children who present with vir-+ ~- D& E2 n0 B! |$ Q2 S9 @
ilization or peripheral precocious puberty. The diag-; w. y& f; r$ y8 ~( D, ]/ `
nosis can be established by just a few tests and by
0 B+ ]5 m( N, y0 R( W$ y6 b9 i7 Fappropriate history. The inability to obtain such a: e% h8 q' W$ B+ F; X( H! k
history, or failure to ask the specific questions, may3 e4 z3 [$ ~$ q2 `. Y
result in extensive, unnecessary, and expensive+ M0 o* e7 t0 B( T4 S; o
investigation. The primary care physician should be
/ n; g2 X+ `/ c" ? f1 R( n x9 Xaware of this fact, because most of these children
1 I; Q- V5 n7 Z, N3 _may initially present in their practice. The Physicians’1 } }' t: @4 h0 i" A6 x6 m, A3 B& b- U
Desk Reference and package insert should also put a& l4 A! d2 S6 i, H5 r2 c
warning about the virilizing effect on a male or. N! }4 h& I; w$ R
female child who might come in contact with some-
2 `7 ^5 w% l' G- O. gone using any of these products.9 b! w5 G) C5 q, h @
References9 ` X0 e% g. N. |3 y
1. Styne DM. The testes: disorder of sexual differentiation
" b2 ]; ?2 }6 r( v$ sand puberty in the male. In: Sperling MA, ed. Pediatric
0 [8 i' i7 p+ a4 }7 _" MEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
9 K o' j. ?3 ]( M8 o: j& r8 M! u% V2002: 565-628.
# Z. v' }' j% s0 X$ F4 _% r- W& B2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious4 P! k* J" i+ `1 t& X- ~
puberty in children with tumours of the suprasellar pineal
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Topical Testosterone Exposure / Bhowmick et al 543
1 i3 b' I- o4 @ u0 i; }% E, E. ?areas: organic central precocious puberty. Acta Paediatr.
: b0 c- R1 Q; S) v2001;90:751-756.4 c1 Y9 ]+ n; V- i* |3 ]' f: P% U
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.' M4 u& Y3 z: m$ \' Q- e
Pediatric Endocrinology. 4th ed. New York, NY: Marcel l5 z; e3 c" D
Dekker Inc; 2003:211-238.
/ v$ \/ G% Y5 M. n4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
1 J8 z$ F% N: Q+ {development in a two-year-old boy induced by topical
* n6 ]& R. v5 z9 U6 \- }exposure to testosterone. Pediatrics. 1999;104:e23.( a$ ^* _$ L: K9 L6 Q
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of: B2 D& l& J% O$ G% Q6 Z
Skeletal Development of the Hand and Wrist. 2nd ed.! |* B4 J, w9 K1 J# e# b* Z2 |8 z- r8 M: L
Stanford, CA: Stanford University Press; 1959.5 ?5 t, ^ n& ]+ A a: h
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