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is a significant concern for physicians. Central
6 f0 u, f' O3 j; R% ]precocious puberty (CPP), which is mediated u+ j( q( L6 Z) K+ o7 p
through the hypothalamic pituitary gonadal axis, has+ x0 A4 I. N6 y7 L! b& j; x
a higher incidence of organic central nervous system7 S2 P- Z& i8 v. g
lesions in boys.1,2 Virilization in boys, as manifested, I* X" d& ^* I$ ~
by enlargement of the penis, development of pubic% t% l- [, e' D/ t5 T; i- |
hair, and facial acne without enlargement of testi-( c- T; Z" {, G1 ?) _
cles, suggests peripheral or pseudopuberty.1-3 We1 p% @" c0 q( H; H1 n
report a 16-month-old boy who presented with the
2 @* L+ U7 y W0 s% Q# j5 j. _enlargement of the phallus and pubic hair develop-
h1 m- R/ w; Xment without testicular enlargement, which was due
6 x9 P. h. V$ o, h8 Pto the unintentional exposure to androgen gel used by
2 Y( D/ f+ a3 hthe father. The family initially concealed this infor-3 U6 C4 d9 ?* {9 R
mation, resulting in an extensive work-up for this
' `; Q+ f( ~* Ychild. Given the widespread and easy availability of
$ C, R# O; u7 ]& |8 |testosterone gel and cream, we believe this is proba-4 ^8 L O, _( `* K$ ~) V. w' L& ]
bly more common than the rare case report in the/ F* K& @/ a4 {+ D9 w7 P% u: S
literature.4
% j' Z' }: h8 Z" e. n0 W, C+ f- KPatient Report" v* k) l! o+ l
A 16-month-old white child was referred to the4 |1 J- S, v* Q! U5 T
endocrine clinic by his pediatrician with the concern8 l" a0 N. O' Q5 o
of early sexual development. His mother noticed
0 ]$ c7 [/ w$ \6 L/ glight colored pubic hair development when he was
. p6 M; X1 z- fFrom the 1Division of Pediatric Endocrinology, 2University of
9 ]7 R9 @5 y6 t) tSouth Alabama Medical Center, Mobile, Alabama.
0 _! f8 a( I' A9 y4 x8 vAddress correspondence to: Samar K. Bhowmick, MD, FACE,: R2 }" q% {: q
Professor of Pediatrics, University of South Alabama, College of$ }; A- t6 I2 n6 X1 U8 g
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;" ~, z$ w5 \* a; a# s
e-mail: [email protected].
# a% a- _$ ]. w9 ~1 U* Babout 6 to 7 months old, which progressively became- Y4 B; |; l0 z1 ~
darker. She was also concerned about the enlarge-! d7 K# m- J/ b! f" X" B
ment of his penis and frequent erections. The child' |/ @ L0 L; {+ U |# H- O
was the product of a full-term normal delivery, with
8 \ z2 H: P$ H0 Q; Q( E4 pa birth weight of 7 lb 14 oz, and birth length of
/ D+ R. i) j% E9 s+ p* ?/ t( D% N20 inches. He was breast-fed throughout the first year C: H j# k8 T2 J
of life and was still receiving breast milk along with$ L$ H2 l O2 c6 a% Y# M
solid food. He had no hospitalizations or surgery,1 [# e% ^( w, K+ I. q% a
and his psychosocial and psychomotor development
. [5 A5 E8 t0 C8 E8 T# u9 `was age appropriate.
* O1 e: o( I1 B7 h" n8 W/ KThe family history was remarkable for the father,6 B! {& S; B1 |! v
who was diagnosed with hypothyroidism at age 16,+ J3 t0 o) p- R
which was treated with thyroxine. The father’s
9 E" L" X: g" ~1 [; qheight was 6 feet, and he went through a somewhat% ^6 Y0 t2 t) C
early puberty and had stopped growing by age 14.
) A2 B( @, B' T0 S( ?9 h' {The father denied taking any other medication. The
4 x9 ~4 U& T& T7 ]( {1 z; d. D" J" k7 jchild’s mother was in good health. Her menarche
, Y" e" S* a, k, i) uwas at 11 years of age, and her height was at 5 feet
2 A" z `% H! d5 inches. There was no other family history of pre-
7 {4 g2 p2 j. y- Wcocious sexual development in the first-degree rela-
; a) X+ J8 {' Z! W' F( g/ ]tives. There were no siblings. O \) a# L0 m$ M9 k9 o
Physical Examination7 B6 Z6 B+ `' G) V+ \/ c
The physical examination revealed a very active,( z. [' U9 P" v
playful, and healthy boy. The vital signs documented
0 l8 T8 x0 v9 M. `9 f4 D0 @a blood pressure of 85/50 mm Hg, his length was
& J' r& A O3 e90 cm (>97th percentile), and his weight was 14.4 kg; Y+ v$ ~6 |& S# ^5 ?
(also >97th percentile). The observed yearly growth% M( Z* ^) L( }
velocity was 30 cm (12 inches). The examination of
Z4 R' Q e, w* r9 p1 q& [% D! athe neck revealed no thyroid enlargement.8 P2 Q- B1 X4 W
The genitourinary examination was remarkable for
5 s: K h/ p$ F/ Henlargement of the penis, with a stretched length of7 a. W9 z* d D% v$ Z# g) ]6 C9 r9 n- p
8 cm and a width of 2 cm. The glans penis was very well5 m: B( S$ E4 a) g
developed. The pubic hair was Tanner II, mostly around
& ?9 K8 H9 L7 j540$ k5 W) S/ J+ B$ H* ~
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ Q& P+ l* W6 o1 ]& X; o; s
the base of the phallus and was dark and curled. The
" m6 j [1 @3 `6 Otesticular volume was prepubertal at 2 mL each.
6 x! l2 q7 j" q( _6 ^The skin was moist and smooth and somewhat9 {! G: x' Z4 k. K2 x* a0 w( c
oily. No axillary hair was noted. There were no7 N5 X9 v z2 x. v) x8 l
abnormal skin pigmentations or café-au-lait spots.
4 S9 S+ @/ o$ N( }2 G6 [+ NNeurologic evaluation showed deep tendon reflex 2+0 p# h+ A6 m) V! }* ^
bilateral and symmetrical. There was no suggestion
/ z# M' ?' m6 e8 w" d( S8 T; u& Oof papilledema.. g' r- K' V% ^0 F
Laboratory Evaluation
/ X1 o- R: r1 E$ I0 w2 @8 d rThe bone age was consistent with 28 months by8 H" b3 L* t% ], `. C, z
using the standard of Greulich and Pyle at a chrono-
' z- k1 F ?+ N; t; T6 |7 Ologic age of 16 months (advanced).5 Chromosomal
& v- Z9 D/ K6 e7 d5 _karyotype was 46XY. The thyroid function test: J+ K3 ~ Y% M
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
# l {" E2 G( _3 o; g8 Wlating hormone level was 1.3 µIU/mL (both normal).: X [) k- B" t2 x
The concentrations of serum electrolytes, blood
* U% t; l& t2 A% o6 c9 H t. @urea nitrogen, creatinine, and calcium all were! X3 B; k: ]( |& L \$ a5 t
within normal range for his age. The concentration
: l1 ]5 l+ F" ?) pof serum 17-hydroxyprogesterone was 16 ng/dL
3 S1 x" {/ S7 [: ?( w(normal, 3 to 90 ng/dL), androstenedione was 20
) ]( F2 R7 t/ S3 n1 {2 R* ^. h1 D; cng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
% E- W: o$ a) M/ eterone was 38 ng/dL (normal, 50 to 760 ng/dL),
0 w3 ^& |( M( I' Q' Odesoxycorticosterone was 4.3 ng/dL (normal, 7 to
% N8 z3 `" v* v! {49ng/dL), 11-desoxycortisol (specific compound S)/ o4 R b8 A9 t! ?% l
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-6 e ]# o# E; Y$ Z
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total4 C. O6 Z* ?; {- I$ U
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),$ N# s! }. b! c" n5 {6 P _
and β-human chorionic gonadotropin was less than8 X+ H1 |# B2 f5 q
5 mIU/mL (normal <5 mIU/mL). Serum follicular
. g5 I. g- Z# |* v, }5 qstimulating hormone and leuteinizing hormone
* w6 w' A$ i/ s7 d: W# g) [5 Gconcentrations were less than 0.05 mIU/mL
5 F1 z' o5 H2 J5 `: F3 P(prepubertal).) A. Z9 j: f# L' U0 s$ [0 U+ M' _
The parents were notified about the laboratory
" x4 r6 K' U5 a, ]1 ]- F# S( r ?results and were informed that all of the tests were7 w1 {7 p: W O4 U; U* Y$ G! N
normal except the testosterone level was high. The% ?- N0 |! b9 ^4 v- f
follow-up visit was arranged within a few weeks to p% C; V+ s; z* o
obtain testicular and abdominal sonograms; how-, M8 M$ z% v& }/ f' K, l- U/ `
ever, the family did not return for 4 months.: d- E4 t! C1 o8 }3 W
Physical examination at this time revealed that the- \: p& ^" e7 `0 H! M4 f) b
child had grown 2.5 cm in 4 months and had gained/ z' ^( Q6 i! W0 ?2 V+ n
2 kg of weight. Physical examination remained1 k5 S+ W5 t9 [, n4 ~
unchanged. Surprisingly, the pubic hair almost com-- Q6 r+ o5 ~2 T- S* L
pletely disappeared except for a few vellous hairs at/ b/ Q$ t( e p5 J' T
the base of the phallus. Testicular volume was still 2 V1 [$ H4 o) s4 Q7 b
mL, and the size of the penis remained unchanged.
7 w) ^9 O7 O' i' oThe mother also said that the boy was no longer hav-: h$ N" Q+ Y! D1 s5 s
ing frequent erections.
7 l" x7 T5 T/ qBoth parents were again questioned about use of
4 X$ O2 m' B D% C! s/ V1 E( r. j) Wany ointment/creams that they may have applied to# H" G2 i) h! m3 g+ Z
the child’s skin. This time the father admitted the
) @4 E& \2 r4 q/ QTopical Testosterone Exposure / Bhowmick et al 5416 U4 N/ n3 u; c% O- w
use of testosterone gel twice daily that he was apply-; p0 O, h% S6 R: u8 b
ing over his own shoulders, chest, and back area for- t+ _' V* d4 u/ a& N2 _8 y
a year. The father also revealed he was embarrassed1 ?. {2 {$ ~0 T/ A
to disclose that he was using a testosterone gel pre-" i) ?" @; \) l& D
scribed by his family physician for decreased libido [+ k. T1 Q. |5 E9 d$ c
secondary to depression.
7 q8 D- t; ?( {* t/ L8 e* }' f, RThe child slept in the same bed with parents.$ L' x; v* S7 O5 |
The father would hug the baby and hold him on his- F2 f5 K! M4 g/ m2 R9 O
chest for a considerable period of time, causing sig-, p8 U. u! n. A
nificant bare skin contact between baby and father.
) w0 v4 m1 A$ t2 t/ V& `The father also admitted that after the phone call,' q* V" E! |$ H0 K, G: K# L% L- I
when he learned the testosterone level in the baby
2 T* _& Z, P% h1 Twas high, he then read the product information; s- s/ k/ G* Y
packet and concluded that it was most likely the rea-
! t/ j2 G% u( T& g0 U Qson for the child’s virilization. At that time, they# n; j+ k2 o$ d+ J$ u3 Z: N7 z5 `
decided to put the baby in a separate bed, and the% y: r9 v2 _- N) Y1 v: h
father was not hugging him with bare skin and had
9 B( J" C# w- m5 a4 _' h7 }been using protective clothing. A repeat testosterone
: V5 v2 q+ U. E5 t- p stest was ordered, but the family did not go to the
- @; W' p" H' y! }. nlaboratory to obtain the test.2 f" E, T4 s2 I7 }7 _
Discussion
1 c4 T# \7 z. Y) B3 U2 \Precocious puberty in boys is defined as secondary
- Q$ R4 n) Q. csexual development before 9 years of age.1,4
) B$ O: G/ |7 j0 g# wPrecocious puberty is termed as central (true) when
+ R8 |6 z7 L, E4 Y. U( S) }# ait is caused by the premature activation of hypo-
U( z8 C" B0 j% Othalamic pituitary gonadal axis. CPP is more com-' `1 g; p7 S ~
mon in girls than in boys.1,3 Most boys with CPP
: A' o: `! X0 {may have a central nervous system lesion that is; O6 _! C P0 f& N! J, }* `8 H' R
responsible for the early activation of the hypothal-
d& T7 x% H2 j6 Q2 Ramic pituitary gonadal axis.1-3 Thus, greater empha-
$ y/ ?9 e( m8 ksis has been given to neuroradiologic imaging in
$ ]- W: f- T3 O0 R% j/ H1 vboys with precocious puberty. In addition to viril-+ W/ t; C: ?4 [
ization, the clinical hallmark of CPP is the symmet-
2 p2 f5 i+ R l- Q. X9 Drical testicular growth secondary to stimulation by4 {# y! R. P8 `+ w. v6 |4 T A
gonadotropins.1,33 q# R8 y' I# _3 `. C" h4 A
Gonadotropin-independent peripheral preco-* p. q, A4 u# {+ b3 M' B& |3 e
cious puberty in boys also results from inappropriate. v+ z. s8 }4 ?- S; I. _" @
androgenic stimulation from either endogenous or
; O c, h1 z1 ]* Nexogenous sources, nonpituitary gonadotropin stim-
- s7 T3 \& x) q; u) b* Culation, and rare activating mutations.3 Virilizing
% R+ e* g5 ]1 M/ q" b/ _' ]+ v& Vcongenital adrenal hyperplasia producing excessive
9 c9 v) H5 U- Q+ l& Qadrenal androgens is a common cause of precocious2 y. @& l9 L1 l4 P# `# e
puberty in boys.3,4
$ b: a4 j0 K- c( nThe most common form of congenital adrenal
" M9 P0 h+ A1 Nhyperplasia is the 21-hydroxylase enzyme deficiency.* W, v$ `* Y* j* v, q0 R/ O
The 11-β hydroxylase deficiency may also result in
, I5 a$ v4 n; t2 `excessive adrenal androgen production, and rarely,
4 n& `6 Q% Y# y0 b* ?an adrenal tumor may also cause adrenal androgen
; S8 U: x' T5 c! }8 C: G+ Rexcess.1,3
, | A( _/ C7 @( \2 U' B6 g/ pat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ I% o. d, F; _( _2 g542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
% S7 x+ B% {' q2 C( pA unique entity of male-limited gonadotropin-
. K1 E7 W7 L- s5 `" m- i! _independent precocious puberty, which is also known- i. }, e7 b- B5 }$ i
as testotoxicosis, may cause precocious puberty at a
" \/ T5 v3 Q$ t1 u. X s& R' ^very young age. The physical findings in these boys" f( @6 w" n7 R3 G
with this disorder are full pubertal development,
* x+ W9 n1 E( c N: Rincluding bilateral testicular growth, similar to boys! l4 \: e( e& a& I' T- Q1 F
with CPP. The gonadotropin levels in this disorder5 n3 Z# _, @3 A. w
are suppressed to prepubertal levels and do not show% F3 B5 v% I# a# [) R
pubertal response of gonadotropin after gonadotropin-
2 D$ K M1 h( c7 d' O4 ~7 Rreleasing hormone stimulation. This is a sex-linked% a; H9 `# k' }; U
autosomal dominant disorder that affects only9 u! ^: \( p n1 u0 I% \9 d6 h/ ^, X
males; therefore, other male members of the family
- [. B9 t% z% I& _. w, x; Kmay have similar precocious puberty.3
" c% X! X; {' j1 E5 w$ FIn our patient, physical examination was incon-- |8 U1 `* \* i/ {" X
sistent with true precocious puberty since his testi-
* N; X6 P! p: E! S8 \- ]7 Fcles were prepubertal in size. However, testotoxicosis, R h) b" l2 l* o9 G$ M" K: c# s
was in the differential diagnosis because his father
: Z2 M8 r: Q" E4 P7 V; _started puberty somewhat early, and occasionally," I% t) `+ a8 P. Q1 B# {4 B
testicular enlargement is not that evident in the
3 s0 C% n; Y7 x& E6 S4 fbeginning of this process.1 In the absence of a neg-
, V9 p' e ?3 }: o" `$ Qative initial history of androgen exposure, our
. A; c6 `. O$ j$ hbiggest concern was virilizing adrenal hyperplasia,
7 y& w) r, a: L% J7 veither 21-hydroxylase deficiency or 11-β hydroxylase. y+ Z" F$ y2 F! M% {
deficiency. Those diagnoses were excluded by find- f, @( @5 W: W: Y: ~
ing the normal level of adrenal steroids.
) G: [6 E( v, J4 o) ZThe diagnosis of exogenous androgens was strongly) D- c2 ^9 I& V" v, `& m' R3 D( E
suspected in a follow-up visit after 4 months because
( h1 C. ?. `# s, Ythe physical examination revealed the complete disap-
' b9 G) x H5 ?: |/ }8 s5 t0 Zpearance of pubic hair, normal growth velocity, and9 }' j! N! w6 O. x/ b& b
decreased erections. The father admitted using a testos-
% s! r, |3 @( a x7 V9 g9 `$ iterone gel, which he concealed at first visit. He was
9 M4 [; a! i* U$ r% uusing it rather frequently, twice a day. The Physicians’
, Z: L' _- F# {" NDesk Reference, or package insert of this product, gel or
1 K/ y7 f$ |( c/ j& ocream, cautions about dermal testosterone transfer to" m+ z3 ]& w# D! |9 f( W
unprotected females through direct skin exposure.
( G& b- W; d+ d1 @6 r: c, CSerum testosterone level was found to be 2 times the
+ e& E, Z/ m Z) obaseline value in those females who were exposed to
7 v3 g' r- E$ N) @- h( o$ o3 U5 Ieven 15 minutes of direct skin contact with their male
% l0 M' U" p$ U" e# Gpartners.6 However, when a shirt covered the applica-
! Y* S2 |# `7 O B$ f1 [- jtion site, this testosterone transfer was prevented.
* @; G& ]/ t4 m# m6 OOur patient’s testosterone level was 60 ng/mL,
$ X$ E! P/ Y7 v7 U' U# H, j/ Bwhich was clearly high. Some studies suggest that3 v. I3 S3 w6 J* N8 q$ `
dermal conversion of testosterone to dihydrotestos-$ k8 x$ A* G a- v
terone, which is a more potent metabolite, is more
" Y$ ]( g" H4 z8 Nactive in young children exposed to testosterone
3 N! Z8 u/ N3 i( k% Cexogenously7; however, we did not measure a dihy-" Y7 N# H5 |' L
drotestosterone level in our patient. In addition to5 r: x9 M5 S5 s: p
virilization, exposure to exogenous testosterone in& q8 r1 `5 [$ E9 I G( T' r
children results in an increase in growth velocity and
! g6 A5 }8 Z4 n* |. q5 @advanced bone age, as seen in our patient.( S& t2 L$ l$ D6 \' o+ O
The long-term effect of androgen exposure during
/ D- t% G# n+ G, C5 oearly childhood on pubertal development and final4 y3 V6 b1 F" F
adult height are not fully known and always remain
. b _6 \) \& c1 {( ja concern. Children treated with short-term testos-
0 V3 W# |8 h2 ~4 i( \: r; wterone injection or topical androgen may exhibit some% ?. j5 r7 y) L. H" ~7 J7 g2 a' h
acceleration of the skeletal maturation; however, after
) l. T# F, f( z% }, J }cessation of treatment, the rate of bone maturation
( d. H; x: X `9 B jdecelerates and gradually returns to normal.8,97 c, G! z( n, Q1 ]
There are conflicting reports and controversy- C8 A) H; e3 D% f. N1 G S* I
over the effect of early androgen exposure on adult
" h9 f3 Y9 v* i. M5 bpenile length.10,11 Some reports suggest subnormal$ k2 z$ `; n% e; Q, Y- N7 i% V$ g
adult penile length, apparently because of downreg-9 |- i& p! M; f: D0 O$ p
ulation of androgen receptor number.10,12 However,
- H' E5 s; W y3 D8 nSutherland et al13 did not find a correlation between
3 ?0 c8 ~4 o3 L% Jchildhood testosterone exposure and reduced adult2 Q) z& l& s' R* f x
penile length in clinical studies." @6 M+ j# j- y; h( t& }
Nonetheless, we do not believe our patient is
0 |7 e* Q @- j: M' jgoing to experience any of the untoward effects from( A8 ]6 S- H; _- Y& t3 k
testosterone exposure as mentioned earlier because' o S- ^# ?: D- u' x: h( u" a
the exposure was not for a prolonged period of time.
: x' x+ p: T. Y! {( ]2 d+ jAlthough the bone age was advanced at the time of
; \! J! ~3 ?3 x8 e' `1 {/ q2 ?diagnosis, the child had a normal growth velocity at& h% d3 m. j+ E" J4 F
the follow-up visit. It is hoped that his final adult! m' k4 V% I2 m) h
height will not be affected.
- R* t. i1 n4 A H1 eAlthough rarely reported, the widespread avail-
: r# x4 I* _& w7 T% W ~+ Uability of androgen products in our society may: H% G6 x+ r6 b' _6 U+ r4 U
indeed cause more virilization in male or female5 V! V: A- A1 k4 I
children than one would realize. Exposure to andro-
" p/ E5 I0 x$ I4 I# @gen products must be considered and specific ques-" {( E; \2 l! u: O! E# z
tioning about the use of a testosterone product or7 s' a% D c1 Q2 u. X% K: J8 H
gel should be asked of the family members during/ Q3 o: V5 r8 ?6 _( f. y
the evaluation of any children who present with vir-% }3 x, d, t) o7 r; n2 M) R
ilization or peripheral precocious puberty. The diag-8 G7 y6 B: R) G6 f: Z
nosis can be established by just a few tests and by
( b3 k0 {& H( L0 j4 @1 c% ]. ]appropriate history. The inability to obtain such a
, r6 E* c5 Q, `$ chistory, or failure to ask the specific questions, may
- q2 ]8 O! O% S. Z8 L; E+ C: ^, b3 Jresult in extensive, unnecessary, and expensive
+ E0 |1 V" H. E* X1 j) C* Xinvestigation. The primary care physician should be3 M9 A8 H% k5 B. I; D0 ^$ ]
aware of this fact, because most of these children) l5 l" s* v' N) ]" n
may initially present in their practice. The Physicians’
& M, u9 g( }. |* s3 }% @6 h, X. d* `Desk Reference and package insert should also put a
4 |+ D) s9 T j8 K/ q6 _5 O9 dwarning about the virilizing effect on a male or
% M& ?- t6 p8 ~6 F0 _( }female child who might come in contact with some-
4 B- m+ x# }1 _& S% x# fone using any of these products.: L3 g/ K) x" V2 O5 V2 T x# Q
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9 f5 h2 m$ g: n+ gEconomics Company, Inc; 2004:3239-3241.
1 E s" o0 q+ l7. Klugo RC, Cerny JC. Response of micropenis to topical8 N6 }" z, ?; w5 `+ [% J
testosterone and gonadotropin. J Urol. 1978;119:
w A0 D$ l4 r6 o& O7 t667-668.) {- ~ X2 E1 Y
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